单项选择题

He displayed a complete lack of courtesy and tact in dealing with his employer.

A．tenacity
B．curiosity
C．civility
D．hostility
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单项选择题
What is at fault in our present system is not the outcome but the fallible procedure.
A．sublime
B．erroneous
C．plausible
D．impeccable
单项选择题
Pirated compact disks and floppy disks remained the second biggest vehicle for the spread of computer viruses despite the governments' determined efforts to quash software piracy.
A．boost
B．prevent
C．crush
D．restrict
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